Contaminated land
Put simply, contaminated land is land containing substances 
at levels that would not normally be present. These substances
may be trace elements, organic compounds, gases such as
carbon dioxide or methane, or even plant nutrients like
nitrogen or phosphorous. The presence of these substances
at elevated levels may, or may not, be harmful. However,
contaminated land is most often used to describe land where
there is at least a suspicion that the contamination could
be harmful to humans, water, buildings, or ecosystems.
Countries may have specific legal definitions of contaminated



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